arch/x86/include/asm/bootparam_utils.h

   1 #ifndef _ASM_X86_BOOTPARAM_UTILS_H
   2 #define _ASM_X86_BOOTPARAM_UTILS_H
   3
   4 #include <asm/bootparam.h>
   5
   6 /*
   7  * This file is included from multiple environments.  Do not
   8  * add completing #includes to make it standalone.
   9  */
  10
  11 /*
  12  * Deal with bootloaders which fail to initialize unknown fields in
  13  * boot_params to zero.  The list fields in this list are taken from
  14  * analysis of kexec-tools; if other broken bootloaders initialize a
  15  * different set of fields we will need to figure out how to disambiguate.
  16  *
  17  */
  18 static void sanitize_boot_params(struct boot_params *boot_params)
  19 {
  20         if (boot_params->sentinel) {
  21                 /*fields in boot_params are not valid, clear them */
  22                 memset(&boot_params->olpc_ofw_header, 0,
  23                        (char *)&boot_params->alt_mem_k -
  24                         (char *)&boot_params->olpc_ofw_header);
  25                 memset(&boot_params->kbd_status, 0,
  26                        (char *)&boot_params->hdr -
  27                        (char *)&boot_params->kbd_status);
  28                 memset(&boot_params->_pad7[0], 0,
  29                        (char *)&boot_params->edd_mbr_sig_buffer[0] -
  30                         (char *)&boot_params->_pad7[0]);
  31                 memset(&boot_params->_pad8[0], 0,
  32                        (char *)&boot_params->eddbuf[0] -
  33                         (char *)&boot_params->_pad8[0]);
  34                 memset(&boot_params->_pad9[0], 0, sizeof(boot_params->_pad9));
  35         }
  36 }
  37
  38 #endif /* _ASM_X86_BOOTPARAM_UTILS_H */